Dart wins a second point in a row, but still trails by two as Boulter goes long.

Harriet Dart momentarily slips, but is able to get back in the point, before Boulter sends a backhand into the net.

Laura Robson
Former British number one on BBC Radio 5 Live and BBC Sounds

There's a lot of passion on court right now.

Why would you give Katie Boulter anything to work with?

Katie Boulter moves four points ahead and only needs four more for the win. Harriet Dart wipes away a tear.

Signs of frustration from Harriet Dart as a first serve goes long. After a long rally following the second, Boulter dances forwards and finds the line with a sweeping forehand.

Jacob Fearnley passes another test. He takes the lead in the fourth set, squeezing to a hold after being taken to deuce thanks to a timely ace.

Nick Lester
Former British tennis player on BBC TV

It's difficult down there. Undoubtedly, the wind is playing a part.

Jonathan Jurejko
BBC Sport at Wimbledon

Cool as a cucumber.

While his nearest and dearest go wild in the stands, Jacob Fearnley sends back a steely stare and an iron-clenched fist.

Is that a hint of a smile? Possibly.

The US college tennis system sees matches played in boisterous atmospheres, but Fearnley told me before the tournament he remains "pretty calm" in the madness.

"I’m not too outgoing," the Texas Christian University graduate said on Friday.

"Before I went to college I was really quiet – college tennis is pretty rowdy and calls for a bit of emotion at times.

"That part of my personality and game can be out there, but I’m pretty chilled out most of the time."

Katie Boulter with a two-point lead in this match-deciding 10-point tie-break, finishing comfortably at the net with Harriet Dart nowhere.

Katie Boulter restores her lead in the 10-point tie-break to decide the match. Harriet Dart just about gets to the first volley, but can't get to a second.

John Lloyd
Former GB Davis Cup captain on BBC TV

I haven't seen Novak Djokovic complaining about anything to do with his body. He's just been complaining about his tennis.

What a point!

Both players come to the net, both get lobbed but recover - Jacob Fearnley even hits a 'tweener - but Novak Djokovic gets over the line with a passing forehand winner.

30-30.

Boulter can only hit the top of the net with a two-handed forehand from the baseline, 2-2.

Charlotte Coates
BBC Sport at Wimbledon

“Allez” is the shout from Ons Jabeur’s team a few rows in front of me.

The 10th seed is hitting the ball great on court two and entertaining the crowd, as she does.

Despite her magic, she doesn’t have it all her own way as she slips before losing the point.

Image source, BBC Sport

A double fault from Dart gives Boulter a 2-1 lead in this 10-point tie-break.

One apiece in the tie-break as Boulter wins the first point quickly, but then goes long.

Harriet Dart holds to love and we go the distance on Court One.

A 10-point tie-break, needing a winning cushion of two points, to settle what has been a wonderful match.

Charlotte Coates
BBC Sport at Wimbledon

Oh no, a spectator has fainted in the crowd on court two and play is stopped as medics rush to their aid.

Ons Jabeur rushes over with water and an isotonic for the poorly spectator.

We’re now back under way as medics work their magic.

Image source, Getty Images

Harriet Dart has already served once to stay in the tournament and now has to do exactly the same again. She had one break point in that excellent 11th game but couldn't take it.

Dart needs to hold to force a 10-point tie-break.

Novak Djokovic hits a forehand long. Out.

British 22-year-old Jacob Fearnley takes the third set against the second seed!

Who saw that coming?!